Function bit_cast

include/fmt/format.h:268–276

// Implementation of std::bit_cast for pre-C++20.
template <typename To, typename From, FMT_ENABLE_IF(sizeof(To) == sizeof(From))>
FMT_CONSTEXPR20 auto bit_cast(const From& from) -> To {
#ifdef __cpp_lib_bit_cast
  if (is_constant_evaluated()) return std::bit_cast<To>(from);
#endif
  auto to = To();
  // The cast suppresses a bogus -Wclass-memaccess on GCC.
  memcpy(static_cast<void*>(&to), &from, sizeof(to));
  return to;
}

inline auto is_big_endian() -> bool {
#ifdef _WIN32